Package org.elasticsearch.xpack.esql.plan.logical.promql

Class PlaceholderRelation

java.lang.Object

org.elasticsearch.xpack.esql.core.tree.Node<LogicalPlan>

org.elasticsearch.xpack.esql.plan.QueryPlan<LogicalPlan>

org.elasticsearch.xpack.esql.plan.logical.LogicalPlan

org.elasticsearch.xpack.esql.plan.logical.LeafPlan

org.elasticsearch.xpack.esql.plan.logical.promql.PlaceholderRelation

All Implemented Interfaces:

NamedWriteable, Writeable, Resolvable

public class PlaceholderRelation
extends LeafPlan

Marker node used inside PromQL as the children of all selectors. When embedded inside ESQL, the relationship can be replaced with the subplan.

Nested Class Summary

Nested classes/interfaces inherited from class org.elasticsearch.xpack.esql.plan.logical.LogicalPlan

LogicalPlan.Stage

Nested classes/interfaces inherited from interface org.elasticsearch.common.io.stream.Writeable

Writeable.Reader<V>, Writeable.Writer<V>

Field Summary

Fields

Modifier and Type	Field	Description
static final LogicalPlan	INSTANCE

Fields inherited from class org.elasticsearch.xpack.esql.core.tree.Node

TO_STRING_MAX_WIDTH

Constructor Summary

Constructors

Constructor	Description
PlaceholderRelation(Source source)

Method Summary

Modifier and Type	Method	Description
boolean	equals(Object obj)
boolean	expressionsResolved()
String	getWriteableName()
int	hashCode()
protected NodeInfo<? extends LogicalPlan>	info()	Normally, you want to use one of the static create methods to implement this.
List<Attribute>	output()	The ordered list of attributes (i.e.
void	writeTo(StreamOutput out)

Methods inherited from class org.elasticsearch.xpack.esql.plan.logical.LeafPlan

computeReferences, replaceChildren

Methods inherited from class org.elasticsearch.xpack.esql.plan.logical.LogicalPlan

analyzed, childrenResolved, optimized, preAnalyzed, preOptimized, resolved, setAnalyzed, setOptimized, setPreAnalyzed, setPreOptimized

Methods inherited from class org.elasticsearch.xpack.esql.plan.QueryPlan

computeExpressions, expressions, forEachExpression, forEachExpression, forEachExpressionDown, forEachExpressionUp, inputSet, outputSet, references, transformExpressionsDown, transformExpressionsDown, transformExpressionsOnly, transformExpressionsOnly, transformExpressionsOnlyUp, transformExpressionsUp, transformExpressionsUp

Methods inherited from class org.elasticsearch.xpack.esql.core.tree.Node

anyMatch, children, collect, collect, collect, collectFirstChildren, collectLeaves, doCollectFirst, forEachDown, forEachDown, forEachDownMayReturnEarly, forEachProperty, forEachPropertyDown, forEachPropertyOnly, forEachPropertyUp, forEachUp, forEachUp, nodeName, nodeProperties, nodeString, propertiesToString, replaceChildrenSameSize, source, sourceLocation, sourceText, toString, transformChildren, transformDown, transformDown, transformDown, transformNodeProps, transformPropertiesDown, transformPropertiesOnly, transformPropertiesUp, transformUp, transformUp, transformUp

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Details

INSTANCE

public static final LogicalPlan INSTANCE

Constructor Details

PlaceholderRelation

public PlaceholderRelation(Source source)

Method Details

expressionsResolved

public boolean expressionsResolved()

Specified by:

expressionsResolved in class LogicalPlan

info

protected NodeInfo<? extends LogicalPlan> info()

Description copied from class: Node

Normally, you want to use one of the static create methods to implement this.

For QueryPlans, it is very important that the properties contain all of the expressions and references relevant to this node, and that all the properties are used in the provided constructor; otherwise query plan transformations like QueryPlan#transformExpressionsOnly(Function) will not have an effect.

Specified by:

info in class Node<LogicalPlan>

hashCode

public int hashCode()

Specified by:

hashCode in class LogicalPlan

equals

public boolean equals(Object obj)

Specified by:

equals in class LogicalPlan

output

public List<Attribute> output()

Description copied from class: QueryPlan

The ordered list of attributes (i.e. columns) this plan produces when executed. Must be called only on resolved plans, otherwise may throw an exception or return wrong results.

Specified by:

output in class QueryPlan<LogicalPlan>

getWriteableName

public String getWriteableName()

writeTo

public void writeTo(StreamOutput out)
             throws IOException

Throws:

IOException